Step one: count your lugs
Before you measure anything, count the lug holes on one of your current wheels (or the studs on your hub). This gives you the first number in the bolt pattern spec. Most passenger cars have 4 or 5 lugs. Full-size trucks typically run 6 or 8. Performance cars and heavy-duty applications sometimes run 5 or 6. The lug count alone narrows your universe considerably — a 4-lug hub will only ever accept a 4-lug wheel.
Measuring 4-lug and 6-lug patterns
Even-numbered lug counts are the easy case. Pick any lug and measure straight across to the lug directly opposite — centre to centre. That distance in millimetres is your PCD. For a 4-lug wheel, you measure across one pair. For a 6-lug wheel, same method: pick a stud, go straight across to the stud directly opposite. The geometry is forgiving here because you're always measuring through the centre of the circle. Common 4-lug PCDs: 100mm (small hatchbacks, older VWs), 108mm (Ford Focus, older European cars). Common 6-lug PCDs: 139.7mm (full-size trucks — GM, Toyota, Nissan, Ford).
Measuring 5-lug patterns (the tricky one)
Five is an odd number, which means no two studs sit directly opposite each other. You can't measure centre-to-centre across the circle. The correct technique: measure from the centre of one stud to the outer edge of the stud that's farthest away — roughly the one "across" from you, offset one position. That measurement gives you the PCD directly. Do it twice from different studs to confirm consistency. Common 5-lug PCDs: 100mm (VW/Audi, Subaru, Mazda3), 105mm (GM compacts), 108mm (Ford, Volvo, Land Rover), 112mm (VW/Audi/Mercedes), 114.3mm (Honda, Toyota, Nissan, Ford Mustang), 120mm (BMW, GM trucks/SUVs), 127mm (Jeep, Ram trucks). If you're getting a number between two common PCDs, re-measure — wheel bolt patterns are standardised and your measurement should land cleanly on a known value.
Tools that make it easier
A digital calliper is ideal for hub-side measurements — you're measuring the raised studs and you want precision to the decimal. A flexible tape measure works for wheel-side measurements where you're going lug hole to lug hole. Bolt-pattern gauges (a plastic template with holes drilled at each common PCD) are available for a few dollars and take the maths out of it entirely: lay the gauge over the studs, find the one that fits, read the pattern off the label. If you're working on the hub rather than the wheel, measure the studs. If you're working on the wheel, measure the lug holes. Either way, the PCD is the same number.
The easier path and next steps
Honestly? The simplest way to confirm your bolt pattern is to enter your year, make, and model into AlloyHaus — we surface the pattern instantly and filter every result to wheels that will mount. If you want to learn the common patterns by vehicle, check our bolt-pattern reference at /guides/bolt-patterns. And if you want to go deeper on what the pattern numbers actually mean and why they matter structurally, the bolt-patterns-explained guide covers the theory behind PCD, hub bore, and the consequences of a mismatch.
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